Numerical prediction of blast-induced wave propagation in the soil

Abstract eng:
The prediction of the effect of blast induced vibrations on structures is a complex problem due to the specific nature of the load. Where empirical or analytical methods fall short, numerical modeling can offer a solution. The occurrence of shock waves and the high strain rates, pressures and deformations involved in this process call for the use of hydrocodes in the area close to the explosion. Linear elastic calculation tools are preferable at larger distances from the blast. A combination of both tools can lead to efficient and complete modeling of an underground blast event. In this paper, a methodology is proposed in which the Autodyn hydrocode is combined with a linear elastic simulation. The possibilities and limitations of the different solvers and modeling tools of Autodyn are examined to determine their use for the simulation of an underground explosion. A finetuned Autodyn model is proposed, dealing with the quality of the transmitting boundary conditions, the deformation of the grid, the solver and material interaction and the prevention of numerical material diffusion.

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